"Hopefully they don't come at all because I really don't want you to get hurt. But if you do want to fight them you should have cold iron on you. Pure iron, by the way. An alloy like steel won't work."

Had he tested this in the past? Yes. Very, very, very carefully. After all, he couldn't touch iron either. He was still a full blooded Fae himself which meant that it burned him as well whether he wanted it to or not. "It's kind of like they're allergic to it. It'll burn them badly if they come into contact with it."